/Engine/Source/Runtime/RenderCore/Public/RenderGraphBuilder.h
Registers a external pooled render target texture to be tracked by the render graph. The name of the registered RDG texture is pulled from the pooled render target.
FRDGTextureRef RegisterExternalTexture ( const [TRefCountPtr](API\Runtime\Core\Templates\TRefCountPtr)< [IPooledRenderTarget](API\Runtime\RenderCore\IPooledRenderTarget) > & ExternalPooledTexture, ERDGTextureFlags Flags )